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Power loss and black smoke after start sometimes
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=89656		 Page 1 of 1
Author:  What, not a Beamer? [ Mon Jan 28, 2019 4:37 pm ]
Post subject:  Power loss and black smoke after start sometimes
Hi,

CRD 2.8 12/2006, automatic, about 180 thousand kilometers on the clock (110 tmiles). Used in proper winter conditions in Finland.

I have a strange intermittent problem. Sometimes (maybe between every 500 miles), when I start the car, it starts normally, then when I get going, the engine lacks power, won't rev properly, stalls or almost stalls, and some black smoke comes out of the exhaust. It feels almost like something was holding and trying to stop the crankshaft, or like the fuel supply was cut as soon as I push the pedal.

After this happens, the engine has always started immediately after quite normally (may require an extra turn or two when starting), but may also stall again. When I let/get it running at idle for a while the issue goes away, and it's like nothing happened. Not even fault codes or warning lights.

I can't connect this to any driving style or anything else either, except I think this happens more likely when there have been sudden temperature changes, like from +5 C to -10 C overnight. I have noticed that this could happen when temperature has recently dropped, but today it also happened when temperature rose from -26 C to -14 C in less than a day. My first thought was if it was due to moisture condensing in fuel line or elsewhere.

So far I have changed fuel filter, air filter, (engine oil & oil filter), and cleaned the MAP (boost) sensor (no dirt found). I also checked for blown head gasket, but that seems OK. Anyways, the problem still exists.

I wonder if it could be a blocked oil circulation in gearbox (automatic), AC compressor, or alternator feeding the glow plugs and pulling the power off the engine… Or a sensor… Or moisture somewhere… :juggle:

During the summer time, I got a low boost pressure fault a few times, but that has not happened after autumn. No real fault found there either, but turbo has not been off the car. Maybe this is somehow related, but I have a feeling it's not. Low boost pressure should not stall the engine, it should just lower the power, right? And in the recent fault, no boost level pressure fault code appears.

Any suggestions?
Author:  GordnadoCRD [ Tue Jan 29, 2019 5:24 am ]
Post subject:  Re: Power loss and black smoke after start sometimes
You have not mentioned the EGR system, and your symptoms sound like ones indicating a faulty / leaking EGR or FCV solenoid(s). If no problems are found here, proceed to the Vacuum solenoids/hoses controlling the turbo.

Do you hear any new / unusual sounds when the problem presents it's self?
Author:  What, not a Beamer? [ Tue Jan 29, 2019 9:19 am ]
Post subject:  Re: Power loss and black smoke after start sometimes
The EGR system is in place, and I haven't disassembled it yet so I obviously need to check it then. FCV valve I haven't touched either yet. Turbo hoses and solenoid I did check in the summertime when I got the low boost pressure codes.

No strange noises during the fault, but the thing is pretty loud in any case.

Thanks for the tips!
Author:  Ludi Neethling [ Wed Jan 30, 2019 8:07 am ]
Post subject:  Re: Power loss and black smoke after start sometimes
Could a faulty Crank Shaft Position Sensor (CPS) be part of the problem? Some of the symptoms (eg. start then no power, can't rev, etc.) was cured when I replaced CPS. Did not show any fault codes.
Author:  What, not a Beamer? [ Sat Aug 01, 2020 6:12 pm ]
Post subject:  Re: Power loss and black smoke after start sometimes
Answering to myself for archives, and whomever reads them...

This fault disappeared by itself. Without further checking the EGR or FCV, just driving and normal maintenance. No glue what it was. (I get CEI every now and then and the low boost power code, but that now seems to be a different fault and most probably related to the EGR system or sensors as proposed).
Author:  What, not a Beamer? [ Sat Jan 16, 2021 8:58 am ]
Post subject:  Re: Power loss and black smoke after start sometimes
And to close the thread: the remaining CEI issues and code for low boost disappeared after repairing the EGR (valve replacement + cleaning + fixed intake leak in the elbow connecting the FCV to intake manifold). And I got noticeably more power also due to fixed intake leak...

Have to say the parts are located really awkwardly, especially the valve and elbow bolts. Many hours of fiddling with mirror and going up in engine bay hanging over the engine and back underneath the car. Easy to understand those who just remove the EGR. I didn't want to do that due to uncertainty of whether it would pass the local MoT without EGR, or not. Apparently it would have, but now it's fixed anyways...
Author:  WWDiesel [ Sat Jan 16, 2021 1:33 pm ]
Post subject:  Re: Power loss and black smoke after start sometimes
What, not a Beamer? wrote:
And to close the thread: the remaining CEI issues and code for low boost disappeared after repairing the EGR (valve replacement + cleaning + fixed intake leak in the elbow connecting the FCV to intake manifold). And I got noticeably more power also due to fixed intake leak...
Have to say the parts are located really awkwardly, especially the valve and elbow bolts. Many hours of fiddling with mirror and going up in engine bay hanging over the engine and back underneath the car. Easy to understand those who just remove the EGR. I didn't want to do that due to uncertainty of whether it would pass the local MoT without EGR, or not. Apparently it would have, but now it's fixed anyways...

If you can, the very best thing you can do for your motors life is to totally remove or at least block off the EGR system.
(Drawing of EGR block off plate shown below)
They are a known engine killer due to making mud soot pies in the intake manifold and contaminating engine oil (soot loading) along with particle blasting the valve stems. See images below.

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